Communicating door lock



COMMUNICATING DOOR LOCK Filed Jan. 24, 1945 I 71 nmn/% 82 r1 .4. 5g f 7&7:4. a

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25 61 6a 52 ZZQATTORNEY Patented May 24, 1949 UNITED STATES PATENTOFFICE COMMUNICATING DOOR LOCK Application January 24, 1945, Serial No.574,315

2 Claims. 1

This invention relates to locks; more particularly to spring projectedlatch bolts with dogging means for the spindle operator of the latchbolt retractor assembly; and still more particularly, to looks forcommunicating doors, bathrooms and the like.

It is an object of my invention to provide a mortice-type of latch boltfor doors and the like, which is exceedingly simple insofar as itinvolves the nature and number of movable parts, wherein dogging of thelatch bolt retractor mechanism assembly is secured in a highly eflectivemanner, and which will withstand most rigorous use, and require theminimum amount of attention for adjustment, replacement and maintenance.

More particularly, it is an object of my invention to provide a lockhaving a spring projected latch bolt which may be readily used incommunicating doors, such as between adjoining rooms of hotels,compartments of trains, steamships, where temporarily at least, suchcommunicating doors may be locked, or in bathrooms of hotels and likeestablishments, where a bathroom is accessible to more than one room,and which may require independent locking from opposite sides of thesame door.

My invention therefore has as an object thereof to provide a lock forcommunicating doors which may be locked from opposite sides, and employa single latch bolt having the retractor mechanism thereof operable fromopposite sides of the door, yet embodying a single bolt, therebyeffecting substantial economies in lock mechanism of this character.

Still further objects of my invention reside in Figure 3 is a sectiontaken on the line 3-3 of Figure 1;

Figure 4 is a section taken on the line 4--4 of Figure 1;

Figures 5 and 6 are perspective views of the rollback and spring hubassembly.

Making reference to the drawings, a lock in accordance with my inventionis illustrated in the form of a casing Ill, morticed within a door H,and held in position edgewise of the door by the end plate l2, employingscrews l3 or like fastening elements. The plate |Z includes an openingl4 through which the latch bolt l5 projects. The latch bolt is affixedto a latch bolt shank [B by screw threading or the like means ofattachment, and is directed rearwardly through the guiding studs I1 andI8, defining a guide slot 19. A helical spring 2|] is convoluted on theshank l6 between the rearward shoulder of the latch bolt l5 and thestuds I1 and IS. The latchbolt is formed with a headed portion 2|,leaving the neck 22 of the shank. A retractor link 23, comprisingbranches 24 and 25, is mounted upon guides 26 and 21 for reciprocation,and these branches terminate forwardly in a cross head having upwardlydirected fingers 28 and 29, which span the neck portion 22 behind thehead 2 I.

Each of the branches 24 and 25 is rearwardly directed to span the rearguides 30 and 3|, affixed to the casing side plate 32. The branches 24and 25 include bearing portions 33 and 34, slidable upon the guides 3|]and 3|, respectively, and are radially and laterally formed with ears 35and 36, respectively. These ears are engaged by camming fingers 31 and38, disposed substantially diametrically on the rollback 39, formed onthe hub 40, entering a bearing orifice 4| in the side plate 32.

The rollback 39 is axially formed with a keyway 42, preferably of squarecontour, to receive a similarly contoured knob spindle 43 in keyedengagement therewith. Preferably the rollback 39 is recessed at 44, toform a housing portion within which may be retained the spool 45 whichcarries a hub portion 46, and is axially formed with a keyway 41,desirably of square contour to receive the knob spindle 43.

The spool 45 has its flanges 48 and 49 provided therebetween with acoiled spring 50, the ends 5| and 52 whereof are bent outwardly radiallyand are held under tension against expansion by straddling to oppositesides of the anchoring pin 53, which is fixed by passing through theflanges 48 and 49. The spool 45 may be housed within the recess 44, toalign the keyways 42 and 47, and this aligned position is maintained byforming the flanges 38 and 49 with splines 54, correspondinglypositioned to the spline 55 formed in the wall of the rollback 39defining the recess 44.

The rollback 39 is also formed with an annular cutout 56, leavingshoulders 57 and 58 spaced apart sufiiciently to allow for anoscillation of the rollback, as will appear more clearly hereinafter,and also to provide a clearance for the radially directed spring ends 5|and 52. With this assembly effected and the keyways 52 and 41 aligned,the spool may be housed within the recess 44 and keyed thereto bydropping a feather pin 59 in the aligned splines 54 and 55.

With the spool 45 housed in the rollback 39 within its recess 64, thehub portion 46 thereof may thereafter be positioned in the cap plate 60and the bearing orifice 6| provided therefor.

As assembled, the camming fingers 3? and 38 arearranged to engage theears 35' and 36, respectively, of the retractor link 23, which, uponoscillation of the spindle 43 Clockwise or counterclockwise, will serveto retract the latchbolt'. l5 acting upon the head'Zl of its shank it;In this manner, knobs 62 and 63 attaohed'to the spindle 43 andprojecting through the apertures ii i' andfili are rotatably mounted onthe escutchoons 855 and 61 for retraction of the latch bolt when eitherof the knobs 62 or 53 is oscillated.

In order to orient the camming fingers 3'1 and 38 of the rollback 39 andthe link'zs actuated thereby, to the neutral position from either of theoscillated positions independently of the spring projected latch bolt,the spring fingers 5| and 52 are arranged to span the pinGlll acting asthe fixed point of resistance forthe coiled spring 5i), with the pin 53acting as the movable point of resistance with respect to the ends 51and 52 upon oscillation of the rollback 39.

The guide fingers 28 and 29 for the link 23 normally abut the studs I?and i3 which'form the forward stops for the link. For clogging the link23 against action by the rollback fingers 3i and 38, I extend from thelink branch alug and provide an engaging face l9 which is substantiallytangential to the axial line of" a pair of locking element hubs l! and72, each of which is rotatably mounted in the side Wall 32, and capplate 8%); respectively, and which have directed through keyways l3 and14 keying spindles l5 and i6, projected through borings'l'l and 18 tosaid keyways 13 and 14, respectively. Escutcheons l9 and 80 rotatablymount the spindles l5 and i6, respectively, and each of the spindles maybe connected to turnbuttons 8i and 82 on opposite faces of the door.

The hubs H and l2 each carry dogging fingers 83' and 84, whose-abuttingends 65 and 85 may both engage the engaging face '59 of the lug 59, tolie against the same and when given limiting engaging movement, each ofthedogging fingers 83 and 84 engages the stop pin it? which is locatedto direct the dogging fingers so and 84 in a pre-dead-center positionwith respect to the lug. face E9, the effect of which relationship ofdogging fingers 83 and 84 to the lug face'l'b is-to take up any play inthe link 23 and" effectively move the fingers 28 and 25 into abuttingposition against the studs I? and I8.

Each of the hubs H and 12 is formed with peripheral flat oamming faces88 and 89, engageable by the detent springs 90 and 9!. The detentsprings 99 and 9! are Wrapped under tension about the anchoring pin 92,to have the free end 93 engage the end wall 94 of the casing.

By the construction shown and described, it will be observed thatspaced, independently operable and aligned dogging fingers 83 and 8 8may each be used to dog the link 23, in turn locking the spindle 43 byengagement effected by the ears 35 and 35 upon the camming fingers 37and 38.

Thus, a single latch bolt may be employed, and with the same secureeffective dogging of the spindle operated mechanism for the latch boltindependentlyto opposite faces of the door, by the turnbuttons 8| and82, where the lock mechanism is used in'a communicating doorinstallation.

It will be understood that while I have shown independent turnbuttons BIand 82 for a communicating door, that key operated means may be employedto rotate the spindles l5 and it, especially where the communicatingdoor may serve as a common door between hotel roomsor compartmentsdesired to bev maintained in a locked' condition to the respectiveoccupants.

It will also be observed'that while I have disclosed independentlyoperable hubs TI and i2, I may provide a common spindle for manipulatingone or both dogging-fingers 83 and 8'4 in unison, where operation fromonly one side of the door is desired; as where the'locking' mechanismisto be used for bathroom doorsor'tlielike.

The housing'of the spring hub spool 45 in the rollback 39, with thefreeends of the spring 5| and 52 spanning the pin 6'8; provides for anoscillation of the rollback 39' to the neutral position, eliminatinglost motion and play between the spindle 43L and the retractor mechanismfor the latch bolt I5. In addition, the installation .and replacementfeatures emphasized inxmy companion applications-filed on even date byme are likewise secured.

It is-further to :be understood-that while I may, bymy construction, dogthe retractor link 23 by the locking elements herein described, leavingthe latch bolt l5 independently depressible, as where'the-latch boltengagesthe strike plate in slamming of the door, that dead-bolting ofthe latch bolt I5 may also be securedrby an alteration of the lockinghubs, as more particularly described in my companion application, SerialNo. 574,316, entitledLatch, filed on even date herewith.

It will be understood thatwhile I have exemplified my invention as ofutility when all of the element illustrated are combined, that isolatedfeatures, segregated from the entire assembly, may. have independentutility and thatmy invention'is, accordingly, not to be limited by theemployment of all of the features illustrated but only by the appendedclaims;

Having thus described by'invention and illustrated its'use, what I'claimas new and desire to secure by Letters Patent is:

1. In a communicating door or the like having a spring projected latch'bolt, the combination therewith comprising a spindle operable rollbackhub-and retractor for'the latch bolt, locking elements mounted uponrotatable hubs, each in cluding a dogglngfinger, a lug on said'retractorfor edgewise contact with said dogging finger, to dog therollback, andindependent means for operating said locking elements independently'toHENRY STEPHEN HARVEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

5 UNITED STATES PATENTS Number Name Date 1,089,435 Page Mar. 10, 19141,507,631 Taylor Sept. 9, 1924 1,771,387 Freysinger July 22, 1930 101,902,343 Shaw Mar. 21, 1933 2,131,458 Turner Sept. 27, 1938 2,164,290Hurd June 27, 1939 FOREIGN PATENTS 15 Number Country Date 444,134 GreatBritain 1- Mar. 16, 1936

